Journal ArticleDOI
Embryogenesis and larval differentiation in sponges
TLDR
Original data on the mode of cleavage, timing of cellular differentiation, and the mechanisms involved in the organization of differentiated cells to form the metazoan body plan are reviewed.Abstract:
Having descended from the first multicellular animals on earth, sponges are a key group in which to seek innovations that form the basis of the metazoan body plan, but sponges themselves have a body plan that is extremely difficult to reconcile with that of other animals. Adult sponges lack overt anterior–posterior polarity and sensory organs, and whether they possess true tissues is even debated. Nevertheless, sexual reproduction occurs as in other metazoans, with the development of embryos through a structured series of cellular divisions and organized rearrangements of cellular material, using both mesenchymal and epithelial movements to form a multicellular embryo. In most cases, the embryo undergoes morphogenesis into a spatially organized larva that has several cell layers, anterior–posterior polarity, and sensory capabilities. Here we review original data on the mode of cleavage, timing of cellular differentiation, and the mechanisms involved in the organization of differentiated cells to form the ...read more
Citations
More filters
Journal ArticleDOI
A phylostratigraphy approach to uncover the genomic history of major adaptations in metazoan lineages
TL;DR: This work uses a phylogenetic framework and embryo expression data from Drosophila to show that grouping genes by their phylogenetic origin can uncover footprints of important adaptive events in evolution.
Journal ArticleDOI
Early evolution of animal cell signaling and adhesion genes
TL;DR: This work demonstrates that the sponge Oscarella carmela, one of the earliest branching animals, expresses core components of the Wnt, transforming growth factor β, receptor tyrosine kinase, Notch, Hedgehog, and Jak/Stat signaling pathways, and infer that key signaling and adhesion genes were in place early in animal evolution, before the divergence of sponge and eumetazoan lineages.
Journal ArticleDOI
The Origin of Animal Multicellularity and Cell Differentiation
Thibaut Brunet,Nicole King +1 more
TL;DR: Two hypotheses for the origin of animal cell types are discussed: division of labor from ancient plurifunctional cells and conversion of temporally alternating phenotypes into spatially juxtaposed cell types.
Journal ArticleDOI
Six major steps in animal evolution: are we derived sponge larvae?
TL;DR: A review of the old and new literature on animal morphology/embryology and molecular studies has led to the following scenario for the early evolution of the metazoans as discussed by the authors.
Journal ArticleDOI
The Genomic and Cellular Foundations of Animal Origins
Daniel J. Richter,Nicole King +1 more
TL;DR: Comparisons among animals and their unicellular and colonial relatives reveal that the Urmetazoan likely possessed a layer of epithelium-like collar cells, preyed on bacteria, reproduced by sperm and egg, and developed through cell division, cell differentiation, and invagination.
References
More filters
Book ChapterDOI
Systema Porifera. A Guide to the Classification of Sponges
TL;DR: In this article, the relevance of sponges and what are sponge taxonomy are discussed. But who would read such a book, and why would anyone want to read it, etc.
Journal ArticleDOI
Evolution of Key Cell Signaling and Adhesion Protein Families Predates Animal Origins
TL;DR: Choanoflagellates express representatives of a surprising number of cell signaling and adhesion protein families that have not previously been isolated from nonmetazoans, including cadherins, C-type lectins, several tyrosine kinases, and tyrosINE kinase signaling pathway components.
Journal ArticleDOI
Phylogeny of the Metazoa Based on Morphological and 18S Ribosomal DNA Evidence
TL;DR: A new phylogenetic classification of the Metazoa including 35 formally recognized phyla and most traditional “phyla” are monophyletic, except for Porifera, Cnidaria (excluding Myxozoa), Platyhelminthes, Brachiopoda, and Rotifera.
Related Papers (5)
The genome of the choanoflagellate Monosiga brevicollis and the origin of metazoans.
Nicole King,M Jody Westbrook,Susan L. Young,Alan Kuo,Monika Abedin,Jarrod Chapman,Stephen R. Fairclough,Uffe Hellsten,Yoh Isogai,Ivica Letunic,Michael T. Marr,David Pincus,Nicholas H. Putnam,Antonis Rokas,Kevin J. Wright,Richard Zuzow,William Dirks,Matthew C. Good,David Goodstein,Derek Lemons,Wanqing Li,Jessica B. Lyons,Andrea Morris,Scott A. Nichols,Daniel J. Richter,Asaf Salamov,J G I Sequencing,Peer Bork,Wendell A. Lim,Gerard Manning,W. Todd Miller,William McGinnis,Harris Shapiro,Robert Tjian,Igor V. Grigoriev,Daniel S. Rokhsar +35 more
Broad phylogenomic sampling improves resolution of the animal tree of life
Casey W. Dunn,Casey W. Dunn,Andreas Hejnol,David Q. Matus,Kevin Pang,William E. Browne,Stephen A. Smith,Elaine C. Seaver,Greg W. Rouse,Matthias Obst,Gregory D. Edgecombe,Martin V. Sørensen,Steven H. D. Haddock,Andreas Schmidt-Rhaesa,Akiko Okusu,Reinhardt Møbjerg Kristensen,Ward C. Wheeler,Mark Q. Martindale,Gonzalo Giribet +18 more
The Amphimedon queenslandica genome and the evolution of animal complexity
Mansi Srivastava,Oleg Simakov,Oleg Simakov,Jarrod Chapman,Bryony Fahey,Marie Gauthier,Marie Gauthier,Therese Mitros,Gemma S. Richards,Gemma S. Richards,Cecilia Conaco,Michael Dacre,Uffe Hellsten,Claire Larroux,Claire Larroux,Nicholas H. Putnam,Mario Stanke,Maja Adamska,Maja Adamska,Aaron E. Darling,Sandie M. Degnan,Todd H. Oakley,David C. Plachetzki,Yufeng Zhai,Marcin Adamski,Marcin Adamski,Andrew D Calcino,Scott F. Cummins,David Goodstein,Christina Harris,Daniel J. Jackson,Daniel J. Jackson,Sally P. Leys,Shengqiang Q. Shu,Ben J. Woodcroft,Michel Vervoort,Kenneth S. Kosik,Gerard Manning,Bernard M. Degnan,Daniel S. Rokhsar,Daniel S. Rokhsar +40 more